Quarterly report pursuant to Section 13 or 15(d)

Warrant Liability - Assumptions Used and Summary of Warrant Liability (Details)

v3.10.0.1
Warrant Liability - Assumptions Used and Summary of Warrant Liability (Details) - $ / shares
6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Minimum | Warrant        
Number of Shares Under Warrant        
Range of Warrant Price Per Share, Granted (in dollars per share)   $ 1.35    
Maximum | Warrant        
Number of Shares Under Warrant        
Range of Warrant Price Per Share, Granted (in dollars per share)   $ 1.50    
June 2018 Warrants        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Volatility rate   80.00%    
Dividend yield   0.00%    
Number of Shares Under Warrant        
Number of shares under warrant, granted   742,991    
Number of Shares Under Warrant, balance at end of period   742,991    
Weighted Average Exercise Price        
Weighted Average Exercise Price, balance at beginning of period (in dollars per share) $ 0 $ 0    
Weighted Average Exercise Price, Granted (in dollars per share)   2.03    
Weighted Average Exercise Price, Exercised (in dollars per share)   0    
Weighted Average Exercise Price, Expired (in dollars per share)   0    
Weighted Average Exercise Price, Balance at end of period (in dollars per share)   2.03    
Weighted Average Exercise Price, Vested and Exercisable at end of period (in dollars per share)   $ 2.03    
Weighted Average Remaining Contractual Life        
Weighted Average Remaining Contractual Life, Balance (in years)   5 years 2 months 19 days   0 years
Weighted Average Remaining Contractual Life, Granted (in years)   5 years 2 months 19 days    
Weighted Average Remaining Contractual Life, Exercised (in years)   0 years    
Weighted Average Remaining Contractual Life, Expired (in years)   0 years    
Weighted Average Remaining Contractual Life, Vested and Exercisable at end of period (in years)   0 years    
June 2018 Warrants | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate   2.93%    
Expected life (years)   4 years 8 months 19 days    
Number of Shares Under Warrant        
Range of Warrant Price Per Share, Granted (in dollars per share)   $ 2.02    
Range of Warrant Price per Share, Outstanding, end of period (in dollars per share)   2.02    
Range of Warrant Price Per Share, Vested and Exercisable at end of period (in dollars per share)   $ 2.02    
June 2018 Warrants | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate   2.95%    
Expected life (years)   5 years 2 months 23 days    
Number of Shares Under Warrant        
Range of Warrant Price Per Share, Granted (in dollars per share)   $ 2.32    
Range of Warrant Price per Share, Outstanding, end of period (in dollars per share)   2.32    
Range of Warrant Price Per Share, Vested and Exercisable at end of period (in dollars per share)   $ 2.32    
2018 Warrants        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Volatility rate   80.00%    
Dividend yield 0.00%      
Number of Shares Under Warrant        
Number of Shares Under Warrant, balance at beginning of period 0 0    
Number of shares under warrant, granted   2,273,700    
Number of shares under warrant, exercised 0      
Number of shares under warrant, expired 0      
Number of Shares Under Warrant, balance at end of period   2,273,700   0
Number of Shares Under Warrant, Vested and Exercisable at end of period   2,273,700    
Range of Warrant Price Per Share, Granted (in dollars per share)   $ 2.80    
Range of Warrant Price per Share, Outstanding, end of period (in dollars per share)   2.80    
Range of Warrant Price Per Share, Vested and Exercisable at end of period (in dollars per share)   2.80    
Weighted Average Exercise Price        
Weighted Average Exercise Price, balance at beginning of period (in dollars per share) $ 0 0    
Weighted Average Exercise Price, Granted (in dollars per share)   2.80    
Weighted Average Exercise Price, Exercised (in dollars per share)   0    
Weighted Average Exercise Price, Expired (in dollars per share)   0    
Weighted Average Exercise Price, Balance at end of period (in dollars per share)   2.80    
Weighted Average Exercise Price, Vested and Exercisable at end of period (in dollars per share)   $ 2.80    
Weighted Average Remaining Contractual Life        
Weighted Average Remaining Contractual Life, Balance (in years)   4 years 10 months 20 days   0 years
Weighted Average Remaining Contractual Life, Granted (in years)   4 years 10 months 20 days    
Weighted Average Remaining Contractual Life, Exercised (in years)   0 years    
Weighted Average Remaining Contractual Life, Expired (in years)   0 years    
Weighted Average Remaining Contractual Life, Vested and Exercisable at end of period (in years)   0 years    
2018 Warrants | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate   2.71%    
Expected life (years)   4 years 7 months 17 days    
2018 Warrants | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate   2.74%    
Expected life (years)   5 years 1 month 17 days    
2017 Warrants        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate   2.89%    
Volatility rate   77.50%    
Expected life (years)   3 years 4 months 13 days    
Dividend yield   0.00%   0.00%
Number of Shares Under Warrant        
Range of Warrant Price per Share, Outstanding, end of period (in dollars per share)   $ 1.50    
2017 Warrants | Warrant        
Number of Shares Under Warrant        
Number of Shares Under Warrant, balance at beginning of period 419,772 419,772    
Number of shares under warrant, granted   0    
Number of shares under warrant, exercised   (9,752)    
Number of shares under warrant, expired   0    
Number of Shares Under Warrant, balance at end of period   410,020   419,772
Number of Shares Under Warrant, Vested and Exercisable at end of period   410,020    
Range of Warrant Price Per Share, Vested and Exercisable at end of period (in dollars per share)   $ 1.50    
Weighted Average Exercise Price        
Weighted Average Exercise Price, balance at beginning of period (in dollars per share) $ 1.46 1.46    
Weighted Average Exercise Price, Granted (in dollars per share)   0    
Weighted Average Exercise Price, Exercised (in dollars per share)   1.50    
Weighted Average Exercise Price, Expired (in dollars per share)   0    
Weighted Average Exercise Price, Balance at end of period (in dollars per share)   1.50    
Weighted Average Exercise Price, Vested and Exercisable at end of period (in dollars per share)   $ 1.50    
Weighted Average Remaining Contractual Life        
Weighted Average Remaining Contractual Life, Balance (in years)   3 years 4 months 17 days   4 years 4 months 17 days
Weighted Average Remaining Contractual Life, Granted (in years)     0 years  
Weighted Average Remaining Contractual Life, Exercised (in years)     0 years  
Weighted Average Remaining Contractual Life, Expired (in years)     0 years  
Weighted Average Remaining Contractual Life, Vested and Exercisable at end of period (in years)   3 years 4 months 17 days    
2017 Warrants | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate       1.68%
Volatility rate       80.00%
Expected life (years)       6 months
2017 Warrants | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate       1.86%
Volatility rate       160.11%
Expected life (years)       5 years